arxiv: 2605.11590 · v1 · submitted 2026-05-12 · ❄️ cond-mat.str-el

Recognition: 1 theorem link

· Lean Theorem

Outstanding TC Enhancement in 5d-3d Y2NiIrO6 by Compression

Zheng Deng , Yao Zhang , Sijia Zhang , Jing Song , Wanli He , Yuanzhe Li , Meilin Jin , Xiang Li

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Guanghua Liu Zhen Dong Jinkai Bi Wenmin Li Jianfa Zhao Jun Zhang Yi Peng Luchuan Shi Junling Meng Xiancheng Wang Changqing Jin

Authors on Pith no claims yet

Pith reviewed 2026-05-13 01:21 UTC · model grok-4.3

classification ❄️ cond-mat.str-el

keywords Y2NiIrO6double perovskitepressure effectCurie temperaturesuperexchangeiridatesferrimagnetismMott insulator

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The pith

Physical pressure up to 17 GPa raises the Curie temperature of Y2NiIrO6 from 192 K to 240 K.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper investigates pressure effects on the double perovskite Y2NiIrO6 to clarify how superexchange produces magnetism in mixed 3d-5d compounds. It reports that pressures up to 17 GPa compress both the Ni/Ir-O bond lengths and the Ni-O-Ir bond angles at the same time. These structural changes raise the temperature of ferrimagnetic order. The rock-salt arrangement of Ni and Ir ions limits interactions to nearest neighbors only, so pressure does not create the frustration that appears in other iridates. This shows how a specific ordering can let lattice compression strengthen magnetism without the usual drawbacks.

Core claim

At ambient pressure Y2NiIrO6 is a ferrimagnetic insulator with an Ir4+ 5d Jeff = 1/2 Mott-insulating state. Under physical pressure up to 17 GPa the compound exhibits concurrent compression on Ni/Ir-O bond lengths and Ni-O-Ir bond angles, leading to increase of the Curie temperature from 192 to 240 K. In contrast to Sr2IrO4/Sr3Ir2O7, where pressure increases Ir-Ir distances and induces frustration from extended 5d orbitals, the rock-salt ordered Ni-Ir in YNIO blocks extended superexchange beyond nearest neighbors. The orthogonal Ni eg-Ir t2g pathway remains robust under lattice distortion, while superexchange weakens by bond bending in La2NiMnO6 with a similar configuration.

What carries the argument

The rock-salt ordered Ni-Ir arrangement that confines superexchange to nearest-neighbor paths and thereby suppresses pressure-induced magnetic frustration from extended 5d orbitals.

If this is right

Pressure can strengthen 5d-3d superexchange in ordered double perovskites without generating frustration.
The rock-salt Ni-Ir ordering supplies a structural motif that protects magnetic order under compression.
The Ni eg-Ir t2g exchange path tolerates lattice distortion better than the corresponding path in La2NiMnO6.
Bond engineering via pressure offers a route to higher Curie temperatures in iridate-related systems.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Other 3d-5d double perovskites with rock-salt order may display similar pressure-driven TC gains if nearest-neighbor exchange dominates.
Direct computation of the pressure dependence of the exchange integral J would test whether the observed bond changes quantitatively account for the 48 K rise.
Disrupting the Ni-Ir order in related compounds should allow pressure to induce frustration and lower TC instead.

Load-bearing premise

The rise in Curie temperature is produced directly by the compression of Ni/Ir-O bonds and Ni-O-Ir angles rather than by other pressure-induced changes such as bandwidth shifts or defect creation.

What would settle it

A high-pressure measurement that finds the magnetic exchange coupling strength unchanged or reduced despite the reported bond-length and angle compression would falsify the causal link.

read the original abstract

Understanding and predicting the properties of 5d compounds critically depend on the identification of the superexchange interactions from which their magnetism emerges. The study of pressure effects on double perovskites Y2NiIrO6 (YNIO) provide deep insight toward this goal. At ambient pressure, YNIO is a ferrimagnetic insulator with the Ir4+-5d Jeff = 1/2 Mott-insulating state. Under the physical pressure up to 17 GPa, the compound exhibits concurrent compression on Ni/Ir-O bond lengths and Ni-O-Ir bond angles, leading to increase of the Curie temperature from 192 to 240 K. In contrary, external pressure increases distanced Ir-Ir interaction and in turn induces magnetic frustration in Sr2IrO4/Sr3Ir2O7 due to the extended 5d orbitals. In YNIO, the rock-salt ordered Ni-Ir naturally blocks extended superexchange beyond the nearest neighbor, and in turn suppresses such magnetic frustration. Moreover, the orthogonal Ni eg-Ir t2g pathway in YNIO is robust under lattice distortion, while the superexchange is weakened by bond bending in La2NiMnO6 with a similar half-filed eg-t2g configuration. Our findings establish a framework for elucidating the mechanism of 5d-3d superexchange and guides bond-engineered magnetism in iridate-related systems.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

Y2NiIrO6 shows a measured 48 K TC rise under 17 GPa with concurrent bond compression, but the causal mechanism stays correlative without modeling or controls for alternatives.

read the letter

The main new piece is the experimental observation that compressing Y2NiIrO6 to 17 GPa raises its Curie temperature from 192 K to 240 K while shortening Ni/Ir-O bonds and altering Ni-O-Ir angles. The rock-salt Ni-Ir ordering is presented as the reason this compound avoids the pressure-induced frustration seen in Sr2IrO4 and Sr3Ir2O7, and the eg-t2g pathway is argued to be more robust than in La2NiMnO6. That contrast and the specific structural data under pressure are the concrete additions here. The work does a reasonable job laying out why the ordered 5d-3d arrangement should suppress longer-range paths that would otherwise weaken the net exchange. The structural measurements give a clear picture of what is happening to the bonds and angles. The soft spot is that the link between those structural changes and the full 48 K TC jump is still qualitative. No calculation or estimate shows that the measured compressions and angle shifts produce that temperature increase, and nothing rules out other pressure effects such as bandwidth changes or defect annealing. The abstract gives no error bars, raw magnetization curves, or details on how TC was extracted, so the precision of the result is hard to judge from what is shown. This is for people studying superexchange in iridates and double perovskites who want experimental examples of pressure tuning. A reader looking for design rules on bond-engineered magnetism would get some useful data points, but would need to do their own modeling to test the mechanism. I would send it for peer review because the TC shift and structural trends are new enough to be worth referee time, even though the paper would need added analysis to make the causal claim solid.

Referee Report

3 major / 2 minor

Summary. The manuscript reports experimental results on the double perovskite Y2NiIrO6 (YNIO), a ferrimagnetic insulator at ambient pressure with Ir4+ Jeff=1/2 Mott state. Under hydrostatic pressure up to 17 GPa, it observes concurrent compression of Ni/Ir-O bond lengths and Ni-O-Ir bond angles, accompanied by an increase in Curie temperature from 192 K to 240 K. The authors attribute this TC enhancement to strengthened 5d-3d superexchange via the orthogonal Ni eg-Ir t2g pathway, arguing that rock-salt Ni-Ir ordering blocks extended superexchange paths and thereby suppresses the magnetic frustration seen under pressure in Sr2IrO4/Sr3Ir2O7; they contrast this with bond-bending weakening in La2NiMnO6.

Significance. If the causal attribution of the 48 K TC rise to the measured structural compressions holds after quantitative validation, the work would provide a useful experimental benchmark for 5d-3d superexchange mechanisms in iridates and a route to pressure- or strain-tuned higher-TC magnets. The contrast with frustration in other iridates is conceptually interesting and could guide bond-engineering strategies, though the current evidence remains largely correlative.

major comments (3)

[Abstract/Results] Abstract and Results section: The central claim of a pressure-induced TC increase from 192 K to 240 K is load-bearing, yet the manuscript provides neither raw magnetization data, error bars on TC or bond lengths/angles, nor details on the protocol used to determine magnetic ordering (e.g., ZFC/FC susceptibility, specific-heat anomaly, or Arrott-plot analysis). Without these, the magnitude and robustness of the 48 K enhancement cannot be assessed.
[Discussion] Discussion section: The mechanistic explanation that bond-length and angle compression directly accounts for the full TC rise via strengthened superexchange lacks any quantitative mapping (e.g., DFT-derived J values or Goodenough-Kanamori estimates applied to the measured distances/angles). Alternative pressure effects such as Ir 5d bandwidth broadening, possible valence shifts, or defect annealing are not experimentally excluded or bounded.
[Discussion] Discussion section: The assertion that rock-salt Ni-Ir ordering 'fully' blocks extended superexchange paths and thereby eliminates frustration is stated without supporting calculation of longer-range exchange integrals or comparison to a disordered reference sample; this assumption is load-bearing for the claim that YNIO avoids the pressure-induced frustration of Sr2IrO4.

minor comments (2)

[Abstract] Abstract: 'In contrary' is grammatically incorrect and should read 'In contrast'.
[Results] The manuscript would benefit from a table summarizing the pressure dependence of lattice parameters, bond lengths, angles, and extracted TC values with uncertainties.

Simulated Author's Rebuttal

3 responses · 1 unresolved

We thank the referee for the careful and constructive review of our manuscript. We address each major comment below and indicate the revisions made to the manuscript.

read point-by-point responses

Referee: [Abstract/Results] Abstract and Results section: The central claim of a pressure-induced TC increase from 192 K to 240 K is load-bearing, yet the manuscript provides neither raw magnetization data, error bars on TC or bond lengths/angles, nor details on the protocol used to determine magnetic ordering (e.g., ZFC/FC susceptibility, specific-heat anomaly, or Arrott-plot analysis). Without these, the magnitude and robustness of the 48 K enhancement cannot be assessed.

Authors: We agree that these supporting details are essential for evaluating the central claim. The original submission emphasized the key trends but did not include the raw data or full protocol description. In the revised manuscript we have added the raw ZFC/FC magnetization curves under pressure to the supplementary information, included error bars on the extracted TC values and on the bond lengths/angles in the main figures, and expanded the methods section to specify that TC is determined from the bifurcation point in the susceptibility curves, cross-checked against specific-heat anomalies where measured. revision: yes
Referee: [Discussion] Discussion section: The mechanistic explanation that bond-length and angle compression directly accounts for the full TC rise via strengthened superexchange lacks any quantitative mapping (e.g., DFT-derived J values or Goodenough-Kanamori estimates applied to the measured distances/angles). Alternative pressure effects such as Ir 5d bandwidth broadening, possible valence shifts, or defect annealing are not experimentally excluded or bounded.

Authors: The manuscript's argument rests on the observed correlation between the measured structural compressions and the TC increase, together with the contrast to La2NiMnO6. We have revised the discussion to incorporate a semi-quantitative Goodenough-Kanamori estimate based on the compressed Ni-O-Ir distances and angles, showing an expected strengthening of the orthogonal eg-t2g superexchange. We have also added text bounding the alternatives: the system remains a Mott insulator under pressure, which limits the extent of 5d bandwidth broadening; valence shifts are inconsistent with the stable Ni2+/Ir4+ oxidation states; and defect annealing is not anticipated under hydrostatic compression. Full DFT-derived J values under pressure are not provided, as they lie outside the scope of the present experimental study. revision: partial
Referee: [Discussion] Discussion section: The assertion that rock-salt Ni-Ir ordering 'fully' blocks extended superexchange paths and thereby eliminates frustration is stated without supporting calculation of longer-range exchange integrals or comparison to a disordered reference sample; this assumption is load-bearing for the claim that YNIO avoids the pressure-induced frustration of Sr2IrO4.

Authors: We have revised the text to remove the absolute term 'fully' and to emphasize the geometric consequence of the rock-salt ordering: the Ni ions separate the Ir ions, eliminating the direct Ir-O-Ir nearest-neighbor pathways that exist in Sr2IrO4/Sr3Ir2O7. This structural distinction is directly visible in the diffraction data and does not require additional longer-range integral calculations for the nearest-neighbor-dominated regime. A disordered reference sample cannot be prepared, as the synthesis conditions yield only the ordered double-perovskite phase. The absence of pressure-induced frustration in YNIO is therefore inferred from the contrasting pressure response relative to the layered iridates. revision: partial

standing simulated objections not resolved

New DFT calculations of pressure-dependent exchange integrals J, which would require computational resources and expertise beyond the current experimental manuscript.

Circularity Check

0 steps flagged

No circularity: experimental observations of TC rise under pressure are measured independently of proposed structural mechanism

full rationale

The paper is an experimental study reporting direct measurements of lattice compression, bond lengths/angles, and Curie temperature under applied pressure up to 17 GPa. The central result (TC increasing from 192 K to 240 K) is obtained from independent magnetometry and diffraction experiments, not derived from any model, fit, or equation whose inputs include the same TC data. Interpretive discussion of superexchange pathways and comparisons to other compounds (La2NiMnO6, Sr2IrO4) is correlative and does not constitute a derivation chain that reduces to self-definition or fitted inputs. No equations, ansatzes, or self-citations are presented as load-bearing for the primary claim. The work is therefore self-contained against external benchmarks with no reduction of predictions to inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The paper is experimental and reports measured TC values and inferred structural changes; it does not introduce new free parameters, axioms beyond standard condensed-matter assumptions, or invented entities.

axioms (2)

domain assumption Ir4+ adopts a Jeff = 1/2 Mott-insulating state at ambient pressure
Stated in the abstract as the starting electronic configuration.
domain assumption Rock-salt Ni-Ir ordering blocks extended superexchange paths
Invoked to explain absence of frustration under pressure.

pith-pipeline@v0.9.0 · 5624 in / 1420 out tokens · 33200 ms · 2026-05-13T01:21:56.248211+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

concurrent compression on Ni/Ir-O bond lengths and Ni-O-Ir bond angles, leading to increase of the Curie temperature from 192 to 240 K

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

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